Process for removing the colour from previously dyed keratinous hair fibres

A process for removing the colour from keratinous hair fibres, wherein the keratinous fibres have been previously dyed by means of at least one composition for dyeing keratinous hair fibres, the at least one composition for dying keratinous hair fibres comprising:

• at least one (poly)carbodiimide compound;
• and
• at least one colouring agent chosen from pigments, direct dyes and mixtures thereof;
• said process for removing colour from keratinous hair fibres comprising:
• i) applying, to the keratinous hair fibres previously dyed by means of said dyeing composition at least one colour-removing composition, the colour-removing composition comprising:
• at least one alkyl or alkylene carbonate;
• and
• ii) applying to said keratinous hair fibres tongs (1) comprising two arms A and B, between which arms said keratinous hair fibres pass,
• each arm A and B comprising a supporting part (2) and an active part (3), said arms A and B being movable between a spaced-apart position in which the active part (3) of each arm A and B are at a distance from one another, and a brought-together position in which the active part (3) of each arm A and B are brought towards one another,
• said active part (3) of each arm A and B comprising an active face (4) and an opposite face (5), said active face (4) having bristles (6),
• wherein, in the brought-together position of the active part (3) of each arm A and B, said bristles (6) of the arms A and B intermingle so as to grip said keratinous hair fibres without blocking them.

A device for dyeing and removing colour from keratinous hair fibres comprising a plurality of compartments containing:

• in a first compartment, a composition A comprising at least one (poly)carbodiimide compound
• chosen from compounds of formula (1):
• in which:
• X1 and X2 independently represent an oxygen atom O, a sulfur atom S or an NH group;
• R1 and R2 independently represent a group chosen from a hydrocarbon-based radical, optionally interrupted with one or more heteroatom(s);
• a group chosen from alkoxysilyl, hydroxysilyl, acetoxysilyl, vinylsilyl, acrylalkylsilyl, methacrylalkylsilyl, crotonylalkylsilyl, carboxyanhydridoalkylsilyl, carboxyalkylsilyl, hydroxyalkylsilyl, aldehydoalkylsilyl, mercaptoalkylsilyl, norbornenylsilyl, acylpentadienylalkylsilyl, maleimidoalkylsilyl, sulfonylalkylsilyl, (meth)acrylalkyl, crotonylalkyl, alkylepoxide and azacyclopropane groups;
• and a hydrocarbon-based radical, optionally interrupted with one or more heteroatom(s) and with one or more groups chosen from alkoxysilyl, hydroxysilyl, acetoxysilyl, vinylsilyl, acrylalkylsilyl, methacrylalkylsilyl, crotonylalkylsilyl, carboxyanhydridoalkylsilyl, carboxyalkylsilyl, hydroxyalkylsilyl, aldehydoalkylsilyl, mercaptoalkylsilyl, norbornenylsilyl, acylpentadienylalkylsilyl, maleimidoalkylsilyl, sulfonylalkylsilyl, (meth)acrylalkyl, crotonylalkyl, alkylepoxide, and azacyclopropane groups;
• n denotes an integer ranging from 1 to 1000;
• and
• A is a monomer chosen from the compounds below:
• and
• in a second compartment, a composition B comprising at least one colouring agent chosen from pigments, direct dyes and mixtures thereof.